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Electrical Saf ety Standards f or LV/MV/HV part 2 (on photo Downtown LA dist ribution power

lines; pho to by Hal Bergman Photography @Flickr)

Electrical Safety Standards for LV/MV/HV(Part-2)

Continued from part 1 Electrical Safety Standards for LV/MV/HV (Part-1)

Content

Standard: Northern Ireland Electricity (NIE), 6/025 ENA

1. Clearances of Electrical Line to Ground and Roads

2. Clearances of Electrical Line to Other Objects
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3. Clearances of Electrical Line to T rees and Hedges

4. Clearances of Electrical Line to Street Lighting

5. Clearances of Electrical Line to Waterways

6. Clearances to Railways

7. Clearances of Electrical Line to Fuel Tanks8. Clearances of Electrical Lines to other Electrical Lines

9. Vert ical Passing Clearance (sites where vehicles will pass below the lines)

10. Horizontal Clearance (sites where there will be no work or passage of plant under lines)

11. Distance between Conductors of Same/Different Circuit (On Same Support)

12. Vertical Distance between Conductors of different Circuit (On Different Support)

13. Distance between Conductors (Taken down f rom Pole to ot her Support, on Transformer)

14. Horizontal Distance of Telecommunication Line & Overhead Line

15. Passage Way for Metal-Clad Switchgear

16. Safe approach distance for Person from Exposed Live Parts

Standard: Northern Ireland Electricity (NIE), 6/025 ENA

Clearances ofElectrical Line to Ground and Roads

DescriptionofClearance

0.4 KV 11 KV 33KV 110KV 220 KV 400KV

Lineconductorto any pointnot overroad

5.2Meter

6.1Meter

6.4Meter

6.4Meter

7.0Meter

7.0Meter

Lineconductorto roadsurface

5.8Meter

6.1Meter

6.4Meter

6.4Meter

7.4Meter

8.1Meter

Lineconductorto roadsurface ofhigh loadroutes

6.9Meter

6.9Meter

6.9Meter

7.2Meter

8.5Meter

9.2Meter
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Bare livemetalwork (transformerterminals,

jumperconnections,etc)

4.6Meter

4.6Meter

4.6Meter

- - -

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Clearances of Electrical Line to Other Objects

Description ofClearance


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Line conductorsto CaravanSites

9.0 Meter 9.0 Meter 9.0 Meter 9.0 Meter 9.0 Meter

Horizontalclearances towells

15.0Meter

15.0Meter

15.0Meter

15.0Meter

15.0 Meter

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Clearances of Electrical Line to Trees and Hedges

Description ofClearance


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hangingverticallyonly

(3) Columnfallingtowards line

- 0.4Meter

0.4Meter

0.8Meter

1.4Meter

1.9Meter

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Clearances of Electrical Line to Waterways

Descriptionof Clearance

0.4 KV 11 KV 33KV 110KV 220 KV 400KV

NavigableWaters:Lower bank toconductor orearth wire

10.5Meter

10.5Meter

10.5Meter

10.5Meter

10.5Meter

10.5Meter

MinorWatercourses

: Lower bankto conductoror earth wire

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

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Clearances to Railways


0.4 KV 11 KV 33KV 110KV 220 KV 400KV

Lineconductorto groundlevel

6.1Meter

6.1Meter

6.1Meter

6.7Meter

7.0Meter

7.6Meter

Lineconductorto groundlevel on or

7.6Meter

8.5Meter

8.5Meter

9.1Meter

9.4Meter

10.1Meter
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acrossvehicleparks

Lineconductorto ground

level atroads andyards,where roadmobilecranes arelikely to beemployed

10.7Meter

10.7Meter

10.7Meter

11.2Meter

11.5Meter

12.2Meter

Line

conductorto Rail level

7.3

Meter

7.3

Meter

7.3

Meter

8.0

Meter

8.2

Meter

8.8

Meter

Lineconductorto the levelof buildings,gantries orotherstructures

(includingthosecarryingtractionwires) onwhich a manmay be

3.0Meter

3.0Meter

3.0Meter

3.7Meter

4.6Meter

6.1Meter

Lineconductor

to polesand ot herprojections.

2.4Meter

2.7Meter

2.7Meter

3.0Meter

3.7Meter

5.5Meter

Lineconductorto any otherwire otherthantraction

wires.

1.8Meter

1.8Meter

1.8Meter

2.4Meter

3.0Meter

3.7Meter

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Clearances of Electrical Line to Fuel Tanks>


0.4 KV 11 KV 33KV 110KV 220 KV 400KV

Horizontalclearancefrom lineconductorsto petroltanks andvents

15Meter

15Meter

15Meter

15Meter

15Meter

15 Meter

Horizontalclearancefrom lineconductorsto liquid gastanks

(1) 459 to2273 litrecapacity

3.0Meter

3.0Meter

3.0Meter

3.4Meter

4.6Meter

5.3Meter

(2) 2274 to9092 litrecapacity

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

(3) Morethan 9093litre.

15Meter

15Meter

15Meter

15Meter

15Meter

15 Meter

Verticalclearancefrom lineconductorsto fuel oiltanks

Please refer Clearances to Objects

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Clearances of Electrical Lines to other Electrical Lines


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0.4 KV 11 KV 33KV 110KV 220 KV 400KV

Lowest lineconductoror earth

wire ofupper line tohighest lineconductorof lowerline.

1.0Meter

1.8Meter

2.0Meter

2.5Meter

3.7Meter

4.4Meter


wire ofupper line toearth wireof lower linewhereerected.

0.7Meter

1.4Meter

1.6Meter

2.5Meter

3.7Meter

4.4Meter


wire ofupper line toany pointon asupport ofthe lowerline onwhich aperson maystand.

2.7Meter

2.8Meter

3.0Meter

3.4Meter

4.6Meter

5.3Meter

Support ofupper lineand anyconductorof lowerline.

7.5Meter

7.5Meter

7.5Meter

15Meter

15Meter

15Meter

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Vertical Passing Clearance (sites where vehicles will pass belowthe lines)


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Descript ion of Clearance 1 KV 2.0 Meter

Above 110 KV All 2.5 Meter

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Vertical Distance between Conductors of different Circuit (OnDifferent Support)

Higher Voltage of either Circuit Distance betweenCircuits

< 1 KV 0.6 Meter

1 KV to 33 KV 1.2 Meter

33 KV to 66 KV 1.8 Meter

110 KV 2.4 Meter

220 KV 2.8 Meter

Go t o Content

Distance between Conductors (Taken down from Pole to otherSupport, on Transformer)

Voltage Distancebetween Circuits

11 KV & LV Line 0.60 Meter



Go t o Content

Horizontal Distance of Telecommunication Line & Overhead Line

Descript ion of Clearance Distance

Telecommunication Line(Not insulated) to HV Line Min 1.6 Meter
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Telecommunication Line (Bare) to LV (Bare) Line Min 1.2 Meter

Telecommunicat ion Line (Covered) to LV (Bare) Line Min 0.6 Meter

Telecommunication Line (Bare) to Stay (Bare) Wire Min 0.3 Meter

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Passage Way for Metal-Clad Switchgear

Descript ion of Clearance Distance

Clean &unobstructed Passages at the front of any Low/High VoltageSwitchgear.

1.0 Meter wide& 2.5 Meterhigh

Clean &unobstructed Passages at side or under any earthedenclosure cont aining Bare Conductor

0.8 Meter wide& 2.2 Meterhigh

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Safe approach distance for Person from Exposed Live Parts

Circuit Voltage Distance

< 1 KV 0.5 Meter

11 KV 1.5 Meter

22 KV 2.0 Meter

33 KV 2.5 Meter

66 KV 3.0 Meter

110 KV 4.0 Meter

>220 KV 6.0 Meter
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